Closed-Loop Rotational Speed Control of Cooling Fan David ChoiJay Gainer Shad LawsKarl Stensvad.

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Presentation transcript:

Closed-Loop Rotational Speed Control of Cooling Fan David ChoiJay Gainer Shad LawsKarl Stensvad

Objectives Closed-loop control of cooling fan based on desired speed Fine tune LabVIEW parameters to quickly and accurately adjust between speeds To plot power usage and efficiency at different fan speeds To plot power usage and efficiency with different intake restricting

Overview Use small light bulb and photoresistor to create encoder Encoder relays fan speed to DAQ LabVIEW interprets encoder input and varies voltage across fan to maintain desired RPM Read current to the fan to calculate power usage and fan efficiency

Logic Overview

Mechanical Features Cooling fan housing Encoder Airflow resistor plates Circuit board

Electronics Tachometer Proto-board Circuit Board

User Interface

Software

Setting Trial Speed

Determination of Speed

Changing Output Voltage

Determination of Error

Calculating Power

Demo

Results and Analysis Fan Rotational Speed Power Draw Efficiency Error

Conclusion We successfully wrote a program that controls the fan speed We verified that power draw increases as airflow restriction and RPM increase We found that efficiency decreases as airflow restriction increases