Radially Repulsive Magnetic Bearing for Optical Self-Alignment
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Solution Overview
Problem
Current systems for maintaining alignment between optical or electromagnetic elements are complex, require expensive electronic components, and experience reliability issues due to non-repeatable alignment forces caused by variations in contact conditions, especially in the presence of thermal or structural drift.
Innovation Solution
A radially repulsive magnetic bearing system using axially polarized magnets, where a first magnet is mounted on one platform and a second concentric magnet is mounted on another, providing self-alignment without the need for active control mechanisms or precise tuning, utilizing readily available permanent magnets to maintain alignment despite thermal or structural changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If active servo-based control mechanisms are used to maintain alignment, then alignment precision can be maintained under thermal drift, but device complexity and cost increase due to electronic components and continuous power supply requirements
Solution Approach 1:
The patent replaces active electronic servo control mechanisms with a passive magnetic alignment system. Two axially polarized magnets are positioned such that their like poles face each other, creating a radially repulsive magnetic field that passively maintains concentric alignment between the first element and second element without requiring electronic components, power supply, or continuous adjustment.
Solution Approach 2:
The magnetic alignment system is self-regulating and requires no external control. The repulsive magnetic force automatically adjusts to maintain alignment as thermal drift or mechanical variations occur, with the magnets self-correcting their positions through the magnetic field interaction without external intervention.
2Reliability
If passive alignment mechanisms with precisely controlled shapes are used, then alignment can be maintained without power, but alignment forces become non-repeatable between insertions due to contact condition variations
Solution Approach 1:
The patent eliminates mechanical contact-based alignment mechanisms (such as ferrules, sleeves, or V-grooves) and replaces them with a magnetic field-based alignment system. The axially polarized magnets create a contactless repulsive force that consistently centers the elements without relying on surface contact conditions, ensuring repeatable alignment forces across multiple insertions and demating operations.
3Strength
If conventional mechanical alignment systems are used, then structural support can be provided, but misalignment occurs due to thermal expansion or contraction of the housings
Solution Approach 1:
The patent utilizes the magnetic field's insensitivity to thermal parameters. Unlike mechanical systems that expand or contract with temperature changes, the magnetic repulsive force between the axially polarized magnets remains stable across temperature variations, maintaining alignment precision despite thermal expansion or contraction of the surrounding housing structures.
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 system effectively maintains high optical coupling between elements by self-aligning optical or electromagnetic components, reducing the need for complex electronics and minimizing the impact of drift, thereby enhancing reliability and reducing costs.
Implementation Method 1
a radially repulsive magnetic bearing, which includes a first axially polarized magnet and a second axially polarized magnet that is concentrically disposed around the first axially polarized magnet and radially repulsive to the first axially polarized magnet
Data Source
Figure 1~2
Figure 3A
Figure 3B
AI summary
Apparatus for self-aligning elements of coupled platforms includes a radially repulsive magnetic bearing. The radially repulsive magnetic bearing includes a first axially polarized magnet (312) and a second axially polarized magnet (314) that is concentrically disposed around the first axially polarized magnet and radially repulsive to the first axially polarized magnet. The radially repulsive magnetic bearing is configured to align a first element (304) of a first platform with a second element (306) of a second platform when the first and second platforms are coupled together.