Centrifuge Temperature Control With Rotor-Speed PID Compensation
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Solution Overview
Problem
The existing centrifuge temperature control systems using PID cooling control algorithms are affected by heat generated from friction between the high-speed rotating rotor and air, leading to inaccuracies in temperature adjustment.
Innovation Solution
A method and device that acquire the current temperature of the centrifugal chamber and determine a target input parameter based on the set temperature and rotational speed, inputting these parameters into a PID controller to adjust the temperature, thereby mitigating the influence of friction-generated heat and improving accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If PID cooling control algorithm is used for refrigeration, then cooling accuracy is improved to a certain extent, but the control is affected by heat generated from friction between high-speed rotating rotor and air, resulting in great difference between actual temperature curve and ideal temperature control curve
Solution Approach 1:
The patent changes the control parameters by introducing rotational speed as an additional input parameter to the PID controller. The target input parameter is determined based on both the set temperature and the set rotational speed of the rotor, allowing the system to compensate for friction-generated heat that varies with rotational speed. This resolves the contradiction by making the temperature control adaptive to the actual operating conditions.
2Speed
If maximum power operation of cooling system is used, then cooling speed is improved, but cooling accuracy deteriorates due to rough cooling mode
Solution Approach 1:
The patent implements dynamic temperature control by making the target input parameter variable based on rotational speed. Instead of using a fixed PID control approach, the system dynamically adjusts the target parameter according to the actual rotational speed, enabling both rapid cooling when needed and precise temperature maintenance when the rotor is stationary or moving slowly.
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 approach enhances the accuracy and efficiency of temperature adjustment in centrifuges by incorporating rotational speed into the control algorithm, reducing the impact of friction-generated heat and ensuring precise temperature control.
Implementation Method 1
heat generated by the friction between the rotor and the air
Implementation Method 2
heat generated by the friction between the high-speed rotating rotor and the air
Data Source
AI summary
Disclosed are a method and a device for temperature control of a centrifuge, a centrifuge and a storage medium. The method for temperature control of a centrifuge includes: acquiring a current temperature of the centrifugal chamber; in a case where a difference between the current temperature and a set temperature is less than or equal to a difference threshold value, according to the set temperature and a set rotational speed of the rotor, determining a target input parameter for temperature adjustment; and inputting the target input parameter, the current temperature and the set temperature into the PID controller.