| Is there any way to drive a brushless motor (AC power supply) other
| than spending a load of money on a ESC? easy with DC but AC is
| another k.o.f altogether,
I'm not sure exactly what you're asking.
Brushless motors are powered by three phase AC. There's no difference
between a brushless motor and a three phase AC motor -- they're the
same thing. A brushless ESC merely takes DC input and approximates a
three phase AC output (but the frequency varies as the motor speed
varies, which it reads via sensors (sensored) or by looking at the
back-EMF produced by the motor (sensorless).)
As for powering it from one phase AC (like you have in your house), I
don't know. I think you can power a three phase motor with one phase
AC under some conditions, but at a loss of efficiency and there's a
problem with getting it started. And of course the rotational rate
will be probably be very low (and fixed!) if only powered by 60 Hz.
I don't see much of an alternative to putting together most of a
brushless ESC to power your motor. (I say `most' because you wouldn't
need the part that reads the servo signal, assuming you just want it
running full-out.) Of course, you'd also need to rectify and smooth
out the AC power ...
This wikipedia page --
is confusing, starting with the name, because it's NOT a DC motor at
all! (They seem to explain this by making the ESC part of the motor,
which I guess is a valid way of looking at it.)
But it does do a good job of explaining how they work.
Doug McLaren, firstname.lastname@example.org Eschew obfuscation!