Hello this is my first message and hi everyone!
I am new to this and electronics, although i have been doing reading lately and here is my first question.
I read somewhere that a brushless motor doesnt work with DC current and will cause short circuit. Why is that?
I understand that the flight controller adjusts the signal that goes to brushless motors, so is it the flight controller or the ESC that turns the DC of battery to AC? Because the Batteries are all DC correct?
Replies
Conventional DC motors "auto-comutate" meaning that they can change their own magnetic fields to give continuous rotation. Brushless motors need an electronic circuit to change their magnetic fields and would just get stuck in one position (then get hot and probably melt!) if they are connected directly to a battery.
An ESC (Electronic Speed Controller) converts the DC voltage from the battery into three phase, AC signals that are used to drive a BLDC (BrushLess DC) motor. These AC signals produce continuous changes in the magnetic fields of the motor and, if connected correctly, these changes can produce continuous rotation.
The flight controller sends a signal to the ESC telling it how fast to turn motor. There is a circuit in the ESC that converts this small signal from the controller into the much more powerful three phase signals need by the motor. The signal from the flight controller is usually a PWM (pulse-width-modulated) waveform although other types of signal can also be used with some ESCs.
I hope this answers your question and welcome to the forum :). L.D.