Vacuum Pump Speed Tuning via Automated Feedback Control
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Solution Overview
Problem
Conventional vacuum pumps in semiconductor manufacturing are over-specified to accommodate various installation requirements, leading to inefficient energy consumption due to operating at higher-than-optimal rotational speeds, and manual adjustments are inaccurate and prone to errors.
Innovation Solution
An automated control scheme that includes a sensor to measure gas characteristics in the chamber and a controller to adjust the vacuum pump's rotational speed based on comparisons with predetermined values, optimizing energy consumption while minimizing human error.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If vacuum pump is over-specified to accommodate various installation requirements, then reliability and adaptability are improved, but energy consumption increases due to operating at higher-than-optimal rotational speeds
Solution Approach 1:
The patent applies dynamics by implementing variable speed control for the vacuum pump. The pump operates at different rotational speeds depending on the actual vacuum requirements rather than maintaining a constant high speed. The controller adjusts the motor speed based on real-time pressure measurements, allowing the pump to operate dynamically at optimal speeds while still meeting performance requirements.
Solution Approach 2:
The patent changes the operational parameters of the vacuum pump by adjusting rotational speed based on actual process needs. The system monitors pressure levels and modifies the pump speed parameter accordingly, transitioning from fixed over-specified operation to adaptive parameter adjustment that maintains reliability while reducing energy consumption.
2Ease of operation
If manual adjustment of pump speed is used to conserve energy, then ease of operation is improved, but measurement precision and manufacturing precision deteriorate due to inaccuracies and inconsistencies
Solution Approach 1:
The patent implements feedback control where a pressure sensor continuously monitors the vacuum level and feeds this information back to the controller. The controller automatically adjusts the pump speed based on the feedback signal to maintain the desired pressure setpoint, eliminating manual adjustment errors and ensuring consistent process conditions.
Solution Approach 2:
The patent replaces the manual mechanical adjustment system with an automated electronic control system. The controller uses electronic signals to adjust the motor speed based on sensor feedback, substituting human operation with an automated system that provides higher precision and consistency while maintaining ease of operation through automatic control.
Data Source
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AI summary
An apparatus for tuning pump speed at an optimal or desired speed using an automated method is disclosed. The apparatus includes a vacuum pump connected to a chamber for evacuating gas from the chamber. A sensor measures one or more characteristics, such as pressure, of the gas in the chamber. The measured characteristic is compared to a predetermined value. The speed of vacuum pump is adjusted based on the comparison until it falls in a desired range.