So I was reading a few questions on drone, and I reach this one.
It said that an ESC is used between the PWM Arduinno's port and the motor. I don't really understand what it means. According to what I understand, a PWM is a varying signal and you just need an electric relay to receive this signal so that the motor receives correct voltage.
However, in other article I read that there are many different ESCs, with firmware and many other parameters to be taken into account. It seems quite overkill for what a relay does, so I am wondering:
- What is inside an ESC?
- More important, what does it do with PWM signal that could not be achieved with a relay and is essential to command the motor?