Does back EMF only occur in DC motors?
I haven’t done AC motors (and I don’t plan to, until my trials) but I know that back EMF occurs in DC motors. As the drill spins, the current flowing (supply emf) is regulated by the back emf. Now when the drill begins to feel resistance against the motion, the back emf is reduced as there is less relative motion between external magnetic field and the coil (part of the drill). As such, there is more current flowing because there is less back emf and so the drill begins to overheat and will short circuit if the drill is not pulled out of the wood (unless there is a circuit breaker). Hope that helps, might need a bit more detail as to why the drill overheats.
