Dipole Ring Magnetic Field Generator Rectangular Magnet Arrangement
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Solution Overview
Problem
Conventional dipole ring magnetic field generators with trapezoidal or fan-shaped permanent magnet pieces are costly to produce and result in high skew angles, which are considered noise and affect the performance of semiconductor manufacturing processes.
Innovation Solution
A dipole ring magnetic field generator using rectangular permanent magnet pieces arranged in a cylindrical yoke with specific positions and orientations to generate a unidirectional magnetic field with reduced skew angle, eliminating the need for costly trapezoidal or fan-shaped magnets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If trapezoidal or fan-shaped permanent magnet pieces are used, then the magnetic field directivity is improved, but the manufacturing cost increases and manufacturing complexity increases
Solution Approach 1:
The patent changes the geometric parameters of the permanent magnet pieces from trapezoidal/fan-shaped to rectangular shapes. This parameter change maintains the magnetic field directivity while significantly simplifying manufacturing processes and reducing costs, as rectangular magnets can be produced more efficiently using standard manufacturing techniques
Solution Approach 2:
The patent introduces asymmetric positioning of rectangular permanent magnet pieces within the cylindrical yoke. By strategically placing rectangular magnets at specific positions and orientations rather than using symmetric trapezoidal shapes, the design achieves the required magnetic field directivity with simpler, more cost-effective rectangular components
2Manufacturing precision
If trapezoidal or fan-shaped permanent magnet pieces are used, then the magnetic field directivity is improved, but the device complexity increases
Solution Approach 1:
The patent simplifies the device by changing the shape parameter of permanent magnet pieces from complex trapezoidal or fan-shaped geometries to simple rectangular shapes. This reduction in geometric complexity decreases device complexity while maintaining functional performance through optimized positioning arrangements
Solution Approach 2:
The patent divides the cylindrical yoke into multiple discrete positions where rectangular permanent magnet pieces are strategically placed. This segmentation approach allows the use of simple rectangular components arranged in a complex pattern, achieving the required magnetic field directivity without requiring each individual magnet to have a complex shape
3Ease of manufacture
If rectangular permanent magnet pieces are used, then the ease of manufacture is improved, but the skew angle increases
Solution Approach 1:
The patent employs preliminary action by pre-calculating and pre-positioning rectangular permanent magnet pieces at specific locations and orientations within the cylindrical yoke. This advance planning of magnet placement compensates for the simpler rectangular shape, ensuring the generated magnetic field achieves the required low skew angle and high directivity
Solution Approach 2:
The patent uses asymmetric positioning of rectangular permanent magnet pieces to compensate for the geometric simplicity of the magnets themselves. By placing rectangular magnets at non-uniform positions and orientations, the design achieves the necessary magnetic field precision with low skew angles while maintaining the manufacturing advantages of rectangular shapes
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 achieves a reduced skew angle and improved directivity of the magnetic field, allowing for efficient and cost-effective production while maintaining high magnetic field intensity, suitable for applications like MRI and semiconductor manufacturing.
Implementation Method 1
at least four permanent magnet units inserted in the at least four magnet insertion holes, the dipole ring magnetic field generator being adapted to generate a substantially unidirectional magnetic field in a radial direction of the cylindrical yoke in an internal space of the cylindrical yoke
Data Source
Figure 1
Figure 2(a)~2(b)
Figure 3
AI summary
Provided is a dipole ring magnetic field generator capable of generating a substantially unidirectional magnetic field in the internal space of a ring without using permanent magnet pieces having fan-shaped or trapezoidal sections, and as a result, a smaller skew angle therein is achieved. The sections of the permanent magnet pieces are shaped to be rectangular, and a plurality of the rectangular permanent magnet pieces are circularly placed at predetermined positions. Each of first, second, third and fourth permanent magnet units, which are main permanent magnet units, comprises five or more permanent magnet pieces. The first and third permanent magnet units, as well as the second and fourth permanent magnet units, are positioned oppositely from each other with respect to a central axis of the magnetic field generator and have hollow shapes or E-shapes facing against each other in a section perpendicular to the central axis.