Re: Looking for mini-VFD for 120VAC/1ph

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Doug Fortune <pentam@...> wrote:

>
>
> Caudlet wrote:
>
> > Since the speed of most AC motors is contolled by the number of

stators

> > and poles and very little by the base frequency a VFD is not

practical

> > for single phase motors and for a universal motor only the voltage
> > reduction will vary the speed.
>
> Very good info, so much for the "simple-off-the-shelf" approach.

However,

> I might just try hooking in an upstream transformer (to lower the

voltage

> before it hits the trimmer electronics). I'll post the results if

successful.

>
> BTW, the application is foam cutting, so very little torque is required.
> Normally, the spindle is going way too fast (for the rapid speed of

the CNC),

> and the cutters/endmills/burrs are melting the foam.
>
> Thanks guys...
>
> Doug

If there is only a very little torque, why not make your own spindle
and use a motor you can change belts with ?

I've made a couple spindles and they can be made pretty simply with a
lathe.

Dave