Magnetic Coupling in Clean-Room Storage Modules
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Solution Overview
Problem
Modular clean room systems face challenges in maintaining ultra-high vacuum conditions due to contamination from particles and impurities, particularly from lubricants and friction-related sources, which compromise the cleanliness of the working atmosphere.
Innovation Solution
The module design separates the drive part and gripper arm into hermetically sealed compartments with magnetic coupling and uses ceramic rollers to minimize particle release, incorporating a sorption pump for further particle reduction, ensuring a non-contact torque-transmitting drive connection and a particle trap to maintain ultra-clean conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanical drive connections with contact are used between drive part and gripper arm, then torque transmission is achieved, but particle contamination and lubricant impurities are introduced into the clean room atmosphere
Solution Approach 1:
The patent replaces traditional mechanical contact drive connections with a magnetic coupling system. The drive part and gripper arm are connected through magnetic fields rather than direct mechanical contact, eliminating the need for lubricants and preventing particle generation from friction and wear. This substitution of mechanical system with magnetic field-based system directly resolves the contradiction between achieving torque transmission and avoiding contamination.
Solution Approach 2:
The patent introduces a magnetic field as an intermediary between the drive part and gripper arm. This magnetic intermediary transmits torque without requiring direct contact between moving parts, thus preventing particle generation and lubricant contamination while maintaining effective force transmission. The magnetic coupling acts as the mediator that enables torque transmission without the harmful side effects of conventional mechanical connections.
2Reliability
If hermetically sealed compartments with magnetic coupling are used, then particle contamination is minimized, but device complexity increases
Solution Approach 1:
The patent divides the handling device into hermetically sealed compartments - a drive part compartment and a gripper arm compartment. This segmentation allows each compartment to be independently sealed and maintained at ultra-high vacuum conditions. The magnetic coupling system bridges these segmented compartments, enabling torque transmission while preserving the integrity of the vacuum seals. This segmentation approach resolves the contradiction by organizing complexity into manageable, isolated modules.
3Object-generated harmful factors
If ceramic rollers are used in magnetic coupling, then friction-related particles are reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent changes the material parameter of the rollers from conventional materials to ceramic materials. Ceramic rollers have superior properties including lower friction, higher hardness, and better resistance to particle generation. This material parameter change enables the system to operate with minimal particle generation while the precision requirements are managed through the magnetic coupling's self-centering capability, which compensates for minor alignment variations.
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 design effectively reduces particle concentration to extreme cleanliness levels, ensuring the quality of work results by minimizing contamination and maintaining ultra-high vacuum conditions, even in extreme cleanliness requirements.
Implementation Method 1
the drive part and the gripper arm are in turn magnetically coupled in rotation without contact
Implementation Method 2
both 'centering' pairs of magnets with magnets opposite one another with their opposite poles and supporting, 'supporting' pairs of magnets are provided, the magnets of which have the same poles facing each other
Implementation Method 3
there is also reduced abrasion in the contact surfaces between the rollers and the partition and a further reduction in the already very low particle load, in particular, for example, through the use of ceramic rollers
Implementation Method 4
A device for maintaining vacuum conditions is known from US Pat. No. 6,570,286 B1, in which a sorption pump is used for particle reduction in an evacuated space of a magnetic bearing
Data Source
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AI summary
The invention relates to a module (1) for a modularly constructed clean-room facility, wherein said module accommodates in the interior (4) thereof a storage unit (7), in particular in the form of a storage carousel, and lying thereunder a handling device (8) having a drive part (9) and a gripper arm (10), wherein the drive part (9) for the gripper arm (10) is arranged in a capsule (14) that bounds a separate space (16) lying inside the interior (4).