Motor Gap Barrier Fluid Purging Against Corrosive Infiltration
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Solution Overview
Problem
Existing semiconductor processing systems face challenges in preventing corrosive and disintegrative fluids from infiltrating and damaging motor components during substrate transfer, leading to reduced system reliability and increased maintenance costs.
Innovation Solution
A motor arrangement with a stator and rotor body separated by a gap, featuring a permanent magnet and a fluid conduit that introduces a barrier fluid with higher density than potential infiltrants, such as hydrochloric acid and hydrogen gas, to create a protective barrier and prevent corrosion and disintegration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gate valves with sealing features are used to prevent corrosive fluid infiltration, then fluid-tight sealing is improved, but device complexity and cost increase
Solution Approach 1:
A barrier fluid (such as nitrogen or another inert gas) is introduced as an intermediary substance between the corrosive process fluid and the motor components. The barrier fluid creates a protective atmosphere that prevents corrosive fluids from reaching the permanent magnets and motor structures, eliminating the need for complex sealing features while maintaining reliability
Solution Approach 2:
The motor arrangement operates within an inert atmosphere created by the barrier fluid. This inert environment prevents corrosive and disintegrative fluids from reacting with or damaging the motor components, particularly the permanent magnets, thereby maintaining reliability without requiring complex sealing mechanisms
2Reliability
If substrate transfer is delayed to allow fluid removal, then corrosion prevention is improved, but productivity decreases
Solution Approach 1:
The barrier fluid is introduced into the motor arrangement before corrosive fluids can infiltrate and cause damage. This preliminary protective action ensures that even if pressure imbalances occur during rapid substrate transfer, the motor components are already protected, allowing continuous high-speed operation without delays
Solution Approach 2:
The barrier fluid maintains continuous protection of the motor components throughout the substrate transfer process. This continuous protective atmosphere allows substrate transfer operations to proceed without interruption or delay, maintaining productivity while ensuring corrosion prevention
3Duration of action of stationary object
If corrosion-resistant materials are used for motor structures, then durability is improved, but manufacturing cost increases
Solution Approach 1:
The barrier fluid serves as an intermediary that prevents corrosive fluids from contacting the motor components. This eliminates the need to use expensive corrosion-resistant materials for the permanent magnets and motor structures, allowing standard materials to be used while maintaining extended service life
Solution Approach 2:
The invention changes the chemical environment parameter around the motor components by introducing an inert barrier fluid. This parameter change (from corrosive to inert atmosphere) protects standard materials from degradation, achieving extended service life without the need for expensive corrosion-resistant materials
4Ease of operation
If pressure imbalances are allowed during substrate transfer, then ease of operation is improved, but harmful infiltration increases
Solution Approach 1:
The barrier fluid acts as an intermediary protective layer that remains in place even when pressure imbalances occur during substrate transfer. This intermediary substance prevents corrosive fluids from infiltrating the motor arrangement, allowing pressure variations necessary for easy substrate transfer while blocking harmful infiltration
Solution Approach 2:
The inert barrier fluid atmosphere within the motor arrangement remains stable despite external pressure changes during substrate transfer. This inert environment prevents corrosive fluids from penetrating into the motor components, allowing ease of operation with pressure imbalances while preventing harmful infiltration
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 effectively prolongs the service life of motor components by preventing corrosive and disintegrative fluids from reaching the permanent magnets, reducing the need for costly countermeasures and minimizing downtime due to component failure.
Implementation Method 1
gravimetrically flowing the barrier fluid into the gap
Implementation Method 2
The barrier fluid has a density that is greater than a density of the infiltrant fluid
Data Source
AI summary
A motor arrangement includes a stator body, a rotor body, a permanent magnet and a fluid conduit. The stator body defines a rotary axis and has a bore. The rotor body is supported for rotary movement about the rotary axis in the bore and is separated from the stator body by a gap. The permanent magnet is arranged within the gap and is fixed to one of the stator body and the rotor body. The fluid conduit is supported above the gap and has an outlet in fluid communication with the gap to separate the permanent magnet from an infiltrant fluid resident within an atmosphere above of the gap by issuing a barrier fluid into the atmosphere above the gap and gravimetrically flowing the barrier fluid into the gap. Semiconductor processing systems, barrier fluid kits, and methods of purging motor arrangements are also described.