Vacuum Chamber Magnetic Drive Layout for Accurate Position Tracking
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Solution Overview
Problem
The existing drive devices for moving a movable portion in a vacuum chamber using magnetic force often experience misregistration due to delayed movement-start timing of the movable-side magnet relative to the drive-side magnet, leading to deviations and potential backlash, especially when changing directions.
Innovation Solution
A drive device configuration that includes a movable-side magnet and a drive unit with a first and second permanent magnet, where the second magnet is arranged adjacent, point-symmetrically, or annularly to the first magnet to stabilize the movable-side magnet's attraction range, allowing it to follow the movement of the drive unit more accurately, reducing misregistration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single drive-side magnet is used to move the movable portion, then the structure is simple and cost-effective, but misregistration occurs due to delayed movement-start timing of the movable-side magnet
Solution Approach 1:
The drive-side magnet is divided into multiple magnets (first drive-side magnet and second drive-side magnet) arranged in an annular configuration. This segmentation allows the magnetic field to be distributed around the movable-side magnet, providing more uniform magnetic force and reducing the delay in movement-start timing, thereby improving positioning accuracy without significantly increasing structural complexity.
Solution Approach 2:
The invention transitions from a single-point magnetic interaction to a distributed annular magnetic field configuration. By arranging drive-side magnets in an annular pattern around the movable-side magnet, the system utilizes spatial distribution in multiple dimensions to improve the responsiveness and reduce misregistration, moving from one-dimensional linear arrangement to two-dimensional annular arrangement.
2Ease of operation
If the movable-side magnet follows the drive-side magnet by magnetic force, then the movable portion can be moved without contact, but a deviation occurs between the positions of the magnets
Solution Approach 1:
The annular arrangement of multiple drive-side magnets segments the magnetic field into multiple zones that collectively act on the movable-side magnet. This segmentation creates a more continuous and uniform magnetic force distribution, reducing the positional deviation that occurs when the movable-side magnet follows the drive-side magnet, while maintaining contactless movement.
Solution Approach 2:
Different regions of the annular magnetic field are optimized to provide specific local magnetic force characteristics. The first and second drive-side magnets are positioned to create complementary magnetic field zones that collectively improve the tracking accuracy of the movable-side magnet, ensuring that each local region contributes to reducing overall positional deviation.
3Weight of moving object
If the movable portion is lightweight to enable easy movement, then small driving force is sufficient, but magnetic force control becomes more critical to prevent misregistration
Solution Approach 1:
The segmented annular configuration of drive-side magnets provides distributed magnetic force control that is particularly effective for lightweight movable portions. The multiple magnetic interaction points allow for finer control of the lightweight object's motion, compensating for its low inertia that would otherwise make it more susceptible to positioning errors and misregistration.
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 reduces the delay in movement-start timing and minimizes misregistration of the movable portion, ensuring accurate positioning and movement within the vacuum chamber, particularly when moving in multiple directions.
Implementation Method 1
a first magnet that exerts magnetic force of attracting the movable-side magnet; a second magnet that is provided to be adjacent to the first magnet, and exerts magnetic force of repelling the movable-side magnet
Data Source
AI summary
A movable-side magnet is provided to a movable portion in a vacuum chamber. A drive unit is provided outside the vacuum chamber, and drives the movable portion by exerting magnetic force on the movable-side magnet. The drive unit has a first magnet, a second magnet, and a moving mechanism (moving member). The first magnet exerts magnetic force of attracting the movable-side magnet. The second magnet is provided to be adjacent to the first magnet, and exerts magnetic force of repelling the movable-side magnet. The moving mechanism integrally moves the first magnet and the second magnet.