PWM Precision Flight Controller Cooling System for UAV in Pineapple Plantation

Abstract

PWM selection is to provide the required operating signal for the flight controller. During the flight, drone technology advances, flight times and distances escalate. The flight controller will become more susceptible to damage, complicating the distance and tasks that the drone will perform—the likelihood of causing high maintenance costs. The appropriate PWM to maintain the cooling system, safeguard to extensive usage of operating signal might be useful to minimize mechanical damage and extend flight longevity. The aim is to develop a cooling system to subside thermal heat in order to raise a UAV's flight time. The study was carried out in a closed environment with room temperature at 32ºC. A flight controller prototype was designed and operated with PWM, and fan revolution speed with temperature was recorded every 15 seconds for 1 minute. The thermal heat reduces by 6ºC from the baseline (40ºC), the fan speed remains constant at 3000-3500 rpm at 45-60 secs during PWM 25%. Whereby, thermal heat reduces by 10ºC from the baseline, the fan speed remains 4000 -5000 rpm at 45-60 secs during PWM 75%,100%. The linearity between the duty cycle of PWM is 98% with fan speed. However, the appropriate duty cycle of PWM set at 50%; the temperature is considerably below 30ºC beginning at 45 secs shows positivity towards cooling systems. Thus, the operating signal is overused during PWM 75% and 100% for 15 secs. The basic concept behind this project is to turn on the DC motor fan when the temperature threshold value of 40ºC.