Re: CNC newbie questions

> > -----Original Message-----

[...]

> > 2/ I'm having trouble understanding the power supply
> > requirements that I've seen documented (e.g. in Gecko Drives'
> > white paper). Assuming the motor is at rest in the 45 degree
> > step position, where the motor will need the maximum current,
> > each winding needs to be powered with Iwinding =
> > Imax/sqrt(2). From this, it would appear to me that the drive
> > power supply needs to provide an average current of 2 x
> > Iwinding = 1.4 x Imax This conclusion doesn't gel at all with
> > the requirements in the white paper (in that my calcs show a
> > MUCH gruntier supply is needed), so I'm confused as to where
> > I've got it wrong.
>
> As Mariss from Gecko points our, the number are VERY specific to a
> Gecko. Other drives will have other current requirements. The guys

that

> do the DenverCNC box did extensive testing with the Xylotex drives

and

> the conclusion is regardless of the voltage you use or the speed

you are

> driving at the maximum power supply draw was 4 amps.

Tim,

Is this 4 amps per motor? If so, then this is even larger than
my calculation (being a peak current of 2.83A for a 2A Imax
motor). Or is it 4A for the 4 axis drive DenverCNC box (i.e.
driving 4 steppers)?

[...]

Thanks,

John Haddy,
Sydney, Australia