Re: Need help with servo power supply design

> I was testing my mill earlier on today to see just how fast I could

push

> the motors. While cutting a complicated shape at about 160IPM

Can you give a little detail on material you were cutting, depth of
cut and type of cutter.


Wally






--- In CAD_CAM_EDM_DRO@yahoogroups.com, Les Newell <lesnewell@h...>
wrote:

> Hi Dave,
>
> 10 amps is the continuous current. You can safely set the peak

current

> much higher than that. Current gives you torque and the more

available

> torque the better. If you use the full 20 amps for any length of

time

> the motors will overheat but in normal use this will never happen

as you

> only need high torque when accelerating hard.
>
> I was testing my mill earlier on today to see just how fast I could

push

> the motors. While cutting a complicated shape at about 160IPM the

drives

> cut out. In investigation I found that the Y axis fuse had blown.

This

> was a 2A antisurge fuse that I had fitted to be safe for testing

and

> completely forgotten to replace. This is a good demonstration of

the

> 'transformer' effect of switching drives. Although the motor was
> probably receiving up to 20 amps the power supply was proibably

only

> supplying peaks of 4A or so.
>
> Les
>
>
> turbulatordude wrote:
>
> >OK, so, I buy a 1.5hp treadmill motor 110 volts. (1.7*746= 1,116
> >watts or 10 amps)
> >
> >I gear it down for my plasma table, 2:1.
> >assuming the power supply will be 66 volts, that is 60% of

nameplate,

> >so would I set the current for 10 amps for the motor maximum ? 6

amps

> >for the max speed calculation ? or something in line with the

power

> >the table needs ?
> >
> >Dave
> >
> >