Re: Ordinary AC motors & position control

> Harko wrote:
> Ac motors can be run by a vector drive as long as there is encoder
> feedback. The only problem is that they generate heat when trying
> to hold position with a load on them.
>
> Jon Elson wrote:
> Yes. A flux-vector drive works this way. Of course, it needs
> an encoder to sense motor position.
>
> Price out a flux vector drive, and you will "easily" see that
> the motor cost is only part of the equation. The drive needs a
> very fancy digital signal processor chip to do the flux vector
> calculations, plus ADCs and a lot of additional hardware not
> needed for a simple VFD. The cheapest thing is a DC brush motor
> and a Gecko or other brush servo drive.

Thanks, I'll look into the vector drive. I have a dsPIC circuit under
development so maybe it can also do this application with some output
changes. I'll also check DC motor prices.