Motors Brushless AC Motors Converts electrical energy into a mechanical energy Out Runner Components of 3 Phase AC Brushless Motor Converts electrical energy into a mechanical energy Out Runner Components of 3 Phase AC Brushless Motor Why 3 Phase Brushless AC Motors Self-starting Less brush sparking (absence of brushes) Robust in construction Economical Easier to maintain Advantage in Drones Out runners for brushed will require lots of wires and additional contacts Efficient than conventional brushed motors 85% to 95% better efficiency than brushed motors Efficient than conventional brushed motors 85% to 95% better efficiency than brushed motors Rotating part is on the outside to generate much more torque More Torque = Faster we can change the speed of our propellers Rotating part is on the outside to generate much more torque More Torque = Faster we can change the speed of our propellers Less electrical energy is wasted Longer Lifetime Fewer moving parts Thrust When a system expels or accelerates mass in one direction, the accelerated mass will cause a force of equal magnitude but opposite direction on that system RPM/KV This is a measure of angular speed, or how fast something is rotating. A motors RPM is simply how fast it can rotate. RPM The KV rating on motor is equal to RPM per VOLT applied to the motor rotate KV Eg: 980 KV motor powered by a 11.1 volt battery would spin at, 980 x 11.1 = 10,878 RPM with no load. Eg: 980 KV motor powered by a 11.1 volt battery would spin at, 980 x 11.1 = 10,878 RPM with no load.