Re: Another Possible Lower cost Servo Controller?

>
> From: Jon Elson <jmelson@...>
> First, there are 2 kinds of AC servo motors (sort of). One has permanent magnets
> in the rotor. It is usually called a brushless DC motor, but in fact is a synchronous
> AC motor. Control of this is fairly easy, but you need an encoder to tell the drive
> where the magnets are in relation to the coils.
>

I just picked up a few of the brushless motors since I got them cheap.
It's not particularly clear at this point, but they appear to have
tachs but no encoders. I was supposed to get specs with them, but
it looks like I'll have to dig for them.

Now, of course, the problem is driving them. Any pointers to sources
of info?

Paul
--
Paul Amaranth | Rochester MI, USA
Aurora Group, Inc. | Systems & Software
paul@... | Unix / Windows / NT