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Closed-Loop Rotational Speed Control of Cooling Fan

Closed-Loop Rotational Speed Control of Cooling Fan. David Choi Jay Gainer Shad Laws Karl Stensvad. Objectives. Closed-loop control of cooling fan based on desired speed Fine tune LabVIEW parameters to quickly and accurately adjust between speeds

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Closed-Loop Rotational Speed Control of Cooling Fan

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  1. Closed-Loop Rotational Speed Control of Cooling Fan David Choi Jay Gainer Shad Laws Karl Stensvad

  2. 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

  3. 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

  4. Logic Overview

  5. Mechanical Features • Cooling fan housing • Encoder • Airflow resistor plates • Circuit board

  6. Electronics • Tachometer • Proto-board • Circuit Board

  7. User Interface

  8. Software

  9. Setting Trial Speed

  10. Determination of Speed

  11. Changing Output Voltage

  12. Determination of Error

  13. Calculating Power

  14. Demo

  15. Results and Analysis • Fan Rotational Speed • Power Draw • Efficiency • Error

  16. 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

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