Multi-Coil Magnet Layout for Single Crystal Field Distribution
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Solution Overview
Problem
The arrangement of coils in single crystal production apparatuses is restricted, limiting the degree of freedom in designing magnetic field distribution, which affects the application of magnetic fields to the material melt, leading to reduced magnetic field intensity in the height direction.
Innovation Solution
A magnet with four or more coils, where at least one coil has a vertically elongated shape with a height-to-width ratio exceeding 1, and a control unit allowing independent magnetic field generation, enhancing the design flexibility of the magnetic field distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If circular annular coils are used with restricted arrangement, then the coil arrangement is simplified, but the magnetic field distribution design freedom is reduced and magnetic field intensity in height direction decreases
Solution Approach 1:
The patent transitions from conventional circular annular coils to rectangular coils with vertically elongated shape (height-to-width ratio exceeding 1). This dimensional change in coil geometry enables the magnetic field to be effectively applied in the height direction of the material melt, overcoming the limitation of circular coils that primarily generate horizontal magnetic fields. The rectangular configuration with enhanced vertical dimension provides new degrees of freedom for magnetic field distribution design while maintaining simplified coil arrangement.
2Manufacturing precision
If coil diameter is reduced to achieve desired magnetic field distribution, then magnetic field distribution improves, but coil height is reduced affecting magnetic field application in height direction
Solution Approach 1:
The patent changes the geometric parameters of the coils from circular to rectangular with a specific height-to-width ratio exceeding 1. This parameter change allows the coils to maintain sufficient height for effective magnetic field application in the vertical direction while achieving the desired magnetic field distribution. The rectangular geometry with enhanced vertical dimension decouples the trade-off between coil size and magnetic field distribution precision that exists with circular coils.
3Ease of manufacture
If conventional circular coils are used, then ease of manufacture is improved, but magnetic field intensity in height direction is reduced
Solution Approach 1:
The patent employs rectangular coils with vertically elongated shape instead of conventional circular coils. This dimensional change in coil geometry fundamentally alters the magnetic field generation characteristics, enabling effective magnetic field application in the height direction. The rectangular configuration with height-to-width ratio exceeding 1 provides superior vertical magnetic field intensity while remaining manufacturable, thus resolving the contradiction between ease of manufacture and magnetic field intensity in the vertical direction.
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 configuration allows for a more flexible magnetic field distribution, reducing the impact on magnetic field application in the height direction and enabling the production of defect-free single crystals with controlled oxygen concentration.
Implementation Method 1
a magnet having a plurality of coils for applying a horizontal magnetic field (transverse magnetic field) to the silicon melt in the crucible
Data Source
AI summary
To provide a magnet for a single crystal production apparatus in which the degree of freedom in the design of the magnetic field distribution is enhanced even when the arrangement of coils composing the magnet of a single crystal production apparatus is restricted. A magnet for a single crystal production apparatus that pulls up a single crystal while applying a horizontal magnetic field to a material melt for the single crystal received in a crucible, the magnet applying the horizontal magnetic field in the single crystal production apparatus, the magnet including four or more coils 2, the ratio of the height to the width of at least one of the four or more coils 2 exceeding 1, and a control unit that enables the four or more coils 2 to generate magnetic fields independently of each other.