Magnetic Chuck for Disc-Like Articles
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Solution Overview
Problem
Existing devices for treating disc-like articles face challenges in securely holding the articles during fluid treatment, particularly at high spin speeds, and require complex mechanisms or risk damaging the articles with excessive force.
Innovation Solution
A device featuring a chuck with a base body and a rotational symmetrical drive ring, where gripping members can be moved eccentrically to securely hold the disc-like article using magnetic forces, allowing for magnetic levitation and independent rotation without physical contact, enabling secure gripping and fluid dispensing without obstructing the treatment process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional holding means are used to secure disc-like articles during treatment, then the articles can be held, but they require complex mechanisms or minimum spin speed to securely hold the articles
Solution Approach 1:
The patent replaces complex mechanical holding mechanisms with a magnetic field-based system. The drive ring generates a magnetic field that interacts with the disc-like article, creating holding and driving forces without mechanical contact. This eliminates the need for complex mechanical structures while maintaining secure holding at various spin speeds.
Solution Approach 2:
The patent utilizes changes in magnetic field parameters (strength, distribution) as spin speed varies to maintain effective holding. The magnetic field configuration automatically adapts to different rotational speeds, providing reliable holding without requiring minimum spin speed thresholds or complex control mechanisms.
2Reliability
If conventional holding means are used to secure disc-like articles during treatment, then the articles can be held, but at very high spin speeds they may hold the disc-like article with a force that could be high enough to harm the disc-like article
Solution Approach 1:
By replacing mechanical contact-based holding with magnetic field interaction, the system avoids concentrated mechanical forces that could damage the article. The magnetic field distributes holding forces more evenly across the article surface, preventing localized stress concentrations that occur with mechanical grippers or clamps.
Solution Approach 2:
The magnetic holding force dynamically adapts to spin speed variations. As the disc-like article rotates, the magnetic field configuration adjusts to maintain optimal holding force, automatically reducing excessive forces at high speeds while ensuring adequate holding at lower speeds, without requiring external control intervention.
3Ease of operation
If magnetic bearings are used to hold and rotate the chuck, then the chuck can be rotated without physical contact, but the distance of stator to rotor is limited
Solution Approach 1:
The patent transitions from traditional axial magnetic bearing configurations to a radial magnetic field configuration using a drive ring. This dimensional change in magnetic field orientation allows for increased radial clearance between the drive ring and stator, enabling contactless rotation with greater distance tolerance while maintaining effective magnetic coupling.
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 device effectively secures disc-like articles during treatment, preventing damage from excessive force while allowing for efficient fluid dispensing and rotation within a sealed chamber, maintaining operational simplicity and safety across various spin speeds.
Implementation Method 1
wherein the drive ring is held by magnetic forces
Implementation Method 2
the relative rotational movement of the drive ring against the base body is carried out by either holding the base body and rotating the drive ring or by holding the drive ring and rotating the base body, whereby the to-be-held-part (drive ring or base body) is held without touching the respective to be held part by magnetic force
Data Source
Figure 1a~1b
Figure 1c~1d
Figure 1e~1f
AI summary
Disclosed is a device for treating a disc-like article with a fluid, the device comprising dispensing means for dispensing a fluid onto the disc-like article and a chuck for holding and rotating a disc-like article around an axis A perpendicular to the disc-like article, the chuck comprises a base body, a drive ring, and gripping members for contacting the disc-like article at its edge, wherein the gripping members are eccentrically movable with respect to the centre of the disc-like article, wherein the eccentric movement of the gripping members is driven by a drive ring, wherein the drive ring is rotatable mounted to the base body, so that the drive ring is rotatable against the base body around the axis A and thereby driving the gripping members, wherein the relative rotational movement of the drive ring against the base body is carried out by either holding the base body and rotating the drive ring or by holding the drive ring and rotating the base body, whereby the to-be-held-part (drive ring or base body) is held without touching the respective to-be-held-part by magnetic force.