Unmanned aerial vehicles (UAV)

Unmanned aerial vehicles (UAVs) or multi-copters come in all shapes and sizes. One of the more common varieties is the quad-copter consisting of a flight controller module and four separate electronic speed controllers (ESCs) to manage the propellers. These tend to use battery-powered BLDC motors each driven by six MOSFETs, with the batteries recharged using a USB connector.

Block diagram

Design considerations

Motors have to support the full weight of the copter continuously while turning at high speed
ESCs need to be properly sized to ensure they can provide the maximum current that is necessary