Re: Motor and Power Supply Questions

Ralph,


www.geckodrive.com, has some excellent PDF-file's on stepper-motor
and power supply's. The voltage should be between 5 and 25 times the
stepper voltage. For your motors this will be something 20 to 100 V.
The higher the voltage the more torque at high speed. Goodluck and
get those PDF-files.

Hugo

CAD_CAM_EDM_DRO@y..., "rawen2" <rawen2@w...> wrote:

> Hi group,
>
> I'm still in the planning stages of converting a benchtop mill to
> CNC. Special thanks to Mariss for explaining in detail how to
> calculate motor sizes. According to his calculations the minimum
> torque would need to be greater than 300oz/in.
>
> I found some used stepper motors - Applied Motion brand; NEMA 34;
> 450oz/in; 4.27V 3.5A; 1.22 ohms; inductance 7.0 mH; 200 steps/rev;
> price $50 ea. The voltage seems to be higher than what I see

others

> using. Would these work well? If not, what problem(s) would I
> encounter? I will be using API brand CMD-260 motor drivers because
> they were the least $$ I could find.
>
> I also found a couple of toroid transformers.
> 1. 36 VAC output @ 2A.
> 2. 26 VAC output @ 5.77 A.
> If my math is correct #1 will put out roughly 50 VDC after
> rectification and #2 will put out about 36 VDC but with greater
> amperage. Which one would be better or are they both too small?
> From what I've read I assume that higher voltage would be better.
>
> Thanks for any help.
>
> Ralph